Talks

9061 - 9072 of 18100 Results

Fundamental Physics Without Colliding Particles

Asimina Arvanitaki Perimeter Institute

October 22, 2014

PIRSA:14100103
PHY 789 - Lecture 2

Niayesh Afshordi University of Waterloo

October 22, 2014

PIRSA:14100123
14/15 PSI - Statistical Mechanics - Lecture 12

Anton Burkov University of Waterloo

October 22, 2014

PIRSA:14100100
14/15 PSI - Conformal Field Theory - Lecture 12

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100024
14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100043
Entanglement Entropy and the Area Law - Lecture 3

Rafael Sorkin Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100071
PHY 789 - Lecture 1

Niayesh Afshordi University of Waterloo

October 21, 2014

PIRSA:14100122
Numerical Study of a Bosonic Topological Insulator in Three Dimensions

Scott Geraedts California Institute of Technology

October 21, 2014

PIRSA:14100113

Condensed Matter
14/15 PSI - Conformal Field Theory - Lecture 11

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100023
Disturbance in weak measurements and the difference between quantum and classical weak values

Asger Ipsen

October 21, 2014

PIRSA:14100114

Quantum Physics
Three-Point Function in N=4 SYM and Spin Vertex

Yunfeng Jiang

October 21, 2014

PIRSA:14100079

High Energy Physics
PHYS 781 - Lecture 8

Niayesh Afshordi University of Waterloo

October 21, 2014

PIRSA:14100054

Fundamental Physics Without Colliding Particles

Asimina Arvanitaki Perimeter Institute

October 22, 2014

PIRSA:14100103
PHY 789 - Lecture 2

Niayesh Afshordi University of Waterloo

October 22, 2014

PIRSA:14100123
14/15 PSI - Statistical Mechanics - Lecture 12

Anton Burkov University of Waterloo

October 22, 2014

PIRSA:14100100
14/15 PSI - Conformal Field Theory - Lecture 12

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100024
14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Tibra Ali Perimeter Institute for Theoretical Physics

Dan Wohns Perimeter Institute for Theoretical Physics

October 22, 2014

PIRSA:14100043
Entanglement Entropy and the Area Law - Lecture 3

Rafael Sorkin Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100071
PHY 789 - Lecture 1

Niayesh Afshordi University of Waterloo

October 21, 2014

PIRSA:14100122
Numerical Study of a Bosonic Topological Insulator in Three Dimensions

Scott Geraedts California Institute of Technology

October 21, 2014

PIRSA:14100113

Condensed Matter

We construct a model which realizes a (3+1)-dimensional symmetry-protected topological phase of bosons with U(1) charge conservation and time reversal symmetry, envisioned by A. Vishwanath and T. Senthil [PRX 4 011016]. Our model works by introducing an additional spin degree of freedom, and binding its hedgehogs to a species of charged bosons. We study the model using Monte Carlo and determine its bulk phase diagram; the phase where the bound states of hedgehogs and charges condense is the topological phase, and we demonstrate this by observing a Witten effect. We also study the surface phase diagram on a (2+1)-dimensional boundary between the topological and trivial insulators. We find a number of exotic phases on the surface, including exotic superfluids, a phase with a Hall conductivity quantized to half the value possible in 2D, and a phase with intrinsic topological order. We also find a new bulk phase with intrinsic topological order.
14/15 PSI - Conformal Field Theory - Lecture 11

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 21, 2014

PIRSA:14100023
Disturbance in weak measurements and the difference between quantum and classical weak values

Asger Ipsen

October 21, 2014

PIRSA:14100114

Quantum Physics

The role of measurement induced disturbance in weak measurements is of central importance for the interpretation of the weak value. Uncontrolled disturbance can interfere with the postselection process and make the weak value dependent on the details of the measurement process. Here we develop the concept of a generalized weak measurement for classical and quantum mechanics. The two cases appear remarkably similar, but we point out some important differences. A priori it is not clear what the correct notion of disturbance should be in the context of weak measurements. We consider three different notions and get three different results: (1) For a `strong' definition of disturbance, we find that weak measurements are disturbing. (2) For a weaker definition we find that a general class of weak measurements are non-disturbing, but that one gets weak values which depend on the measurement process. (3) Finally, with respect to an operational definition of the `degree of disturbance', we find that the AAV weak measurements are the least disturbing, but that the disturbance is still non-zero.
Three-Point Function in N=4 SYM and Spin Vertex

Yunfeng Jiang

October 21, 2014

PIRSA:14100079

High Energy Physics

In this talk I will explain how to compute three-point functions of N=4 SYM theory in the planar limit for tree level and one-loop in perturbation theory. First I will recall how to formulate the problem of computing the three-point function of operators with determined R-charges in the language of integrable spin chains. In the su(2) sector, the tree-level three point function can be obtained in terms of determinants, whose large R-charge limit can be taken explicitly. Then I will report a systematic method to compute the su(2) three point function at higher loops. In particular, we are able to take the semi-classical limit, and we can compare our result with the calculation from string theory. In the Frolov-Tseytlin limit we find a perfect match at one-loop. Finally I will present a new formalism of computing three-point functions called the spin vertex formalism, which is the weak coupling counter-part of the string vertex in the string field theory. I will describe how to construct the spin vertex and discuss its important properties.
PHYS 781 - Lecture 8

Niayesh Afshordi University of Waterloo

October 21, 2014

PIRSA:14100054

Title	Date	Collection	Type	Info
Fundamental Physics Without Colliding Particles	2014‑10‑22		Conference	View details
PHY 789 - Lecture 2	2014‑10‑22		Course	View details
14/15 PSI - Statistical Mechanics - Lecture 12	2014‑10‑22	14/15 PSI - Statistical Mechanics	Course	View details
14/15 PSI - Conformal Field Theory - Lecture 12	2014‑10‑22	14/15 PSI - Conformal Field Theory	Course	View details
14/15 PSI - Quantum Field Theory I (A) - Lecture 12	2014‑10‑22	14/15 PSI - Quantum Field Theory	Course	View details
Entanglement Entropy and the Area Law - Lecture 3	2014‑10‑21	Entanglement Entropy and the Area Law	Course	View details
PHY 789 - Lecture 1	2014‑10‑21		Course	View details
Numerical Study of a Bosonic Topological Insulator in Three Dimensions	2014‑10‑21	Quantum Matter	Scientific Series	View details
14/15 PSI - Conformal Field Theory - Lecture 11	2014‑10‑21	14/15 PSI - Conformal Field Theory	Course	View details
Disturbance in weak measurements and the difference between quantum and classical weak values	2014‑10‑21	Quantum Foundations	Scientific Series	View details
Three-Point Function in N=4 SYM and Spin Vertex	2014‑10‑21	Quantum Fields and Strings	Scientific Series	View details
PHYS 781 - Lecture 8	2014‑10‑21	PHYS 781 - Fundamentals of Astrophysics	Course	View details

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Format results

Fundamental Physics Without Colliding Particles

PHY 789 - Lecture 2

14/15 PSI - Statistical Mechanics - Lecture 12

14/15 PSI - Conformal Field Theory - Lecture 12

14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Entanglement Entropy and the Area Law - Lecture 3

PHY 789 - Lecture 1

Numerical Study of a Bosonic Topological Insulator in Three Dimensions

14/15 PSI - Conformal Field Theory - Lecture 11

Disturbance in weak measurements and the difference between quantum and classical weak values

Three-Point Function in N=4 SYM and Spin Vertex

PHYS 781 - Lecture 8

Fundamental Physics Without Colliding Particles

PHY 789 - Lecture 2

14/15 PSI - Statistical Mechanics - Lecture 12

14/15 PSI - Conformal Field Theory - Lecture 12

14/15 PSI - Quantum Field Theory I (A) - Lecture 12

Entanglement Entropy and the Area Law - Lecture 3

PHY 789 - Lecture 1

Numerical Study of a Bosonic Topological Insulator in Three Dimensions

14/15 PSI - Conformal Field Theory - Lecture 11

Disturbance in weak measurements and the difference between quantum and classical weak values

Three-Point Function in N=4 SYM and Spin Vertex

PHYS 781 - Lecture 8